:root {
            --amarelo: #FFC107;
            --branco: #FFFFFF;
            --preto: #000000;
        }
        
        body {
            background-color: #f8f9fa;
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
        }
        
        .header {
            background-color: var(--preto);
            color: var(--branco);
            padding: 20px 0;
            margin-bottom: 30px;
        }
        
        .logo {
            font-size: 1.8rem;
            font-weight: bold;
            color: var(--amarelo);
        }
        
        .card-header-custom {
            background-color: var(--preto);
            color: var(--branco);
            border-bottom: 3px solid var(--amarelo);
        }
        
        .btn-primary-custom {
            background-color: var(--amarelo);
            color: var(--preto);
            border: none;
            font-weight: 600;
        }
        
        .btn-primary-custom:hover {
            background-color: #e0a800;
            color: var(--preto);
        }
        
        .btn-outline-custom {
            border: 1px solid var(--preto);
            color: var(--preto);
        }
        
        .btn-outline-custom:hover {
            background-color: var(--preto);
            color: var(--branco);
        }
        
        .alert-custom {
            border-left: 4px solid var(--amarelo);
        }
        
        .channel-badge {
            display: inline-flex;
            align-items: center;
            margin: 5px;
            padding: 8px 15px;
            background-color: #f8f9fa;
            border: 1px solid #dee2e6;
            border-radius: 20px;
            cursor: pointer;
            transition: all 0.2s;
        }
        
        .channel-badge:hover {
            background-color: #e9ecef;
        }
        
        .channel-badge.selected {
            background-color: var(--amarelo);
            border-color: var(--amarelo);
            font-weight: 600;
        }
        
        .channel-badge input {
            display: none;
        }
        
        .channel-icon {
            margin-right: 8px;
            font-size: 1.2rem;
        }
        
        .channel-badge.whatsapp.selected {
            background-color: #25D366;
            color: white;
            border-color: #25D366;
        }
        
        .channel-badge.telefone.selected {
            background-color: #0d6efd;
            color: white;
            border-color: #0d6efd;
        }
        
        .channel-badge.discador.selected {
            background-color: #fd7e14;
            color: white;
            border-color: #fd7e14;
        }
        
        .channel-badge.pap.selected {
            background-color: #6f42c1;
            color: white;
            border-color: #6f42c1;
        }
        
        .section-title {
            color: var(--preto);
            font-weight: 600;
            margin: 20px 0 15px;
            display: flex;
            align-items: center;
        }
        
        .section-title i {
            margin-right: 10px;
            color: var(--amarelo);
        }